What is the main idea of the passage? The passage suggests that oxygen remained in the atmosphere because ______.

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问题 What is the main idea of the passage?
The passage suggests that oxygen remained in the atmosphere because ______.

选项 A、it was caused by outgassing
B、it was heavier than hydrogen
C、hydrogen became trapped in limestone
D、rays from the sun created equal amounts of hydrogen and oxygen ______.

答案B

解析

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托福（TOEFL）

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What is the main idea of the passage? The passage suggests that oxygen remained in the atmosphere because ______.

托福（TOEFL）

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